To provide a dust-removal device of a downsized lateral-type structure for treating various kinds of vapor phase fluids as an object to be treated, easily adapting the recovery of an object to be removed to various kinds of conditions and suitable for a position where the vertical height is restricted.

A swirl dust-removal part A1 comprises an inner air-leading cylinder body 2 and an outer surrounding cylinder body 3 which keeps the direction of a cylinder axis is adjusted to a horizontal direction. A dust separation part 31 for permitting running out of the object to be removed outside of the swirl is formed on a part of the outer surrounding cylinder body 3. A ventilation part 23 for short circuit for sucking at a position above an introduction port at a lower end is formed in an air-leading cylinder body 2. An external taking out cylinder 7 for guiding the object to be removed dropping off from the swirl flow of the dust separation part 31 to the outside of the casing 1 and dropping off by the own weight is provided. The outer surrounding cylinder body constituting the swirl dust-removal part is relatively rotated around a cylinder axis and is constituted to change the direction of an intake port.

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